/*
 Copyright 2010 Dmitry Naumenko (dm.naumenko@gmail.com)

 Licensed under the Apache License, Version 2.0 (the "License");
 you may not use this file except in compliance with the License.
 You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

 Unless required by applicable law or agreed to in writing, software
 distributed under the License is distributed on an "AS IS" BASIS,
 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 */
package sg.atom.utils.datastructure.delta.diff;

import java.util.List;

/**
 * Describes the add-delta between original and revised texts.
 *
 * @author <a href="dm.naumenko@gmail.com">Dmitry Naumenko</a>
 */
public class InsertDelta extends Delta {

    /**
     * {@inheritDoc}
     */
    public InsertDelta(Chunk original, Chunk revised) {
        super(original, revised);
    }

    /**
     * {@inheritDoc}
     *
     * @throws PatchFailedException
     */
    @Override
    public void applyTo(List<Object> target) throws PatchFailedException {
        verify(target);
        int position = this.getOriginal().getPosition();
        List<?> lines = this.getRevised().getLines();
        for (int i = 0; i < lines.size(); i++) {
            target.add(position + i, lines.get(i));
        }
    }

    /**
     * {@inheritDoc}
     */
    @Override
    public void restore(List<Object> target) {
        int position = getRevised().getPosition();
        int size = getRevised().size();
        for (int i = 0; i < size; i++) {
            target.remove(position);
        }
    }

    @Override
    public void verify(List<?> target) throws PatchFailedException {
        if (getOriginal().getPosition() > target.size()) {
            throw new PatchFailedException("Incorrect patch for delta: "
                    + "delta original position > target size");
        }

    }

    public TYPE getType() {
        return Delta.TYPE.INSERT;
    }

    @Override
    public String toString() {
        return "[InsertDelta, position: " + getOriginal().getPosition() + ", lines: "
                + getRevised().getLines() + "]";
    }
}
